1,3-bis(substituted benzylideneamino)guanidines

ABSTRACT

The preparation of 1,3-bis(4- and 3,4-substituted benzylideneamino)guanidines and their salts, and of 1-loweralkyl1,3-bis(4- and 3,4-substituted benzylideneamino)guanidines and their salts and of 1,3-diloweralkyl-1,3-bis(4- and 3,4substituted benzylideneamino)guanidines and their salts from 1,3diaminoguanidine and its salts, and from 1-loweralkyl-1,3diaminoguanidine and its salts and from 1,3-diamino-1,3diloweralkylguanidine and its salts, respectively, and N-loweralkanoyl derivatives thereof. Also the preparation of certain lower alkanoyl derivatives of the aforementioned products. The compositions and compounds prepared have antiprotozoal activity particularly against coccidiosis and malaria.

United States Patent 11 1 Tomcufcik [4 1 Aug. 26, 1975 l,3-BlS(SUBSTITUTED BENZYLIDENEAMJNO)GUANIDINES Andrew Stephen Tomcufcik, Old Tappan, NJ.

[75] Inventor:

American Cyanamid Company, Stamford, Conn.

[22] Filed: July 27, 1973 [21] Appl. No.: 383,419

Related US. Application Data [63] Continuation-inpart of Ser. No. 215L096, May S, I972 abandoned, which is :1 continuation-in-part of Ser. No. 94,59l, Dec. 2, 1970. Pat. No. 3,769,432, which is a continuation-in-part of Ser. No. 833,l67, June [3, I969, abandoned, which is a continuation-in-part of Ser. No. 741,247, July I, 1968, abandoned.

[73] Assignee:

52 vs. C]. 260/564 F; 260/457; 260/465 E; 260/552 so; 260/562 H; 260/562 P;

511 1m. (:1. C0713 133/10 581 Field of Search 260/564 F, 562 P, 562 H, 260/457, 465 E [56] References Cited UNITED STATES PATENTS 3,130,232 4/1964 Paquette 260/564 F OTHER PUBLICATIONS Lieber et al., J. Org. Chem. Vol. 17, pp. 5l8522 (1952).

Primary Examiner-Gerald A. Schwartz Attorney, Agent, or Firm-Emest Y. Miller [5 7] ABSTRACT The preparation of l,3'bis(4- and 3,4-substituted benzylideneamino)guanidines and their salts, and of l-loweralkyl-l.3-bis(4- and 3,4-substituted benzylideneamino)guanidines and their salts and of l,3-diloweralkyl-l,3-bis(4- and 3,4-substituted benzylideneamino)guanidines and their salts from 1,3- diaminoguanidine and its salts, and from l-loweralkyll,3-diaminoguanidine and its salts and from L3- diamino-l,3-diloweralkylguanidine and its salts, respectively, and N-lower-alkanoyl derivatives thereof. Also the preparation of certain lower alkanoyl derivatives of the aforementioned products.

The compositions and compounds prepared have antiprotozoal activity particularly against coccidiosis and malaria.

7 Claims, No Drawings l l ,3-B IS(SUBSTITUTED BENZYLIDENEAMINO )GUANIDINES This application is a continuation-in-part of my application Ser. No. l .096 filed May 8. 1972. now abandoned. which is a continuation-in-part of my application Ser. No. 94,591. filed Dec. 2. I970. now US. Pat. No. 3.769.432. which is a continuation-in-part of application Ser. No. 833.167, filed June 13. I969. now abandoned, which is a continuation-in-part of application Ser. No. 74l.247. filed July I. [968. now abandoned.

PRIOR APPLICATION In my original application. Ser. No. 74l.247 compounds which are substituted guanidines of the following structure are claimed:

wherein R, and R are halogen. trifluoromethyl or cyano. R- and R are hydrogen or halogen. and the phar macologically acceptable acid salts thereof.

Subsequently. a continuation-in-part application Serial No. 833.167 was filed June 13. 1969 in which compounds which are substituted guanidines of the following structure are claimed:

wherein R, and R are halogen. trifluoromethyl or cyano. R and R.-, are hydrogen or halogen. R and R are hydrogen or lower alkyl (C -C and R is hydrogen or lower alkanoyl (CK-C and the pharmacologically acceptable acid salts thereof.

Subsequently. a continuation-inpart application Serial No. 94.59] was filed in which compounds which are substituted guanidines of the following structure are claimed:

wherein R and R are selected from the group consisting of halogen. trifluoromethyl. trifluoromethoxy. and cyano; R and R are selected from the group consisting of hydrogen and halogen; R and R are selected from the group consisting of hydrogen and lower alkyl, and R is selected from the group consisting of hydrogen and lower alkanoyl, is a single or double bond, n is an integer selected from 0 and l with the proviso that when is a double bond then u is when 0 and when is a single bond. then u is l. and the pharmacologically acceptable acid salts thereof.

Upon requirement for restriction in Ser. No. 94.591 an application Ser. No. 25l,()96 was filed and was directed to compounds of the following structure:

wherein R and R are selected from the group consisting of halogen. trifluoromethyl. trif'luoromethoxy. and cyano; R and R are selected from the group consisting of hydrogen and halogen; R; and R,. are selected from the group consisting of hydrogen and lower alkyl; and R is selected from the group consisting of hydrogen and lower alkanoyl, is a single or double bond, :1 is an integer selected from (J and l with the proviso that when is a double bond then It is 0 and when is a single bond. then u is l. and the pharmacologically acceptable acid salts thereof.

The acid salts can be, for example, nitrate. hydrochloride, hydrobromide. methosulfate, and the like.

The term loweralkyl is intended to include those having 1 to 4 carbon atoms and the term lower alkanoyl. those having I to 4 carbons in addition to the carbonyl group. The term halogen includes chlorine. bromine. fluorine. and iodine.

The compounds of this invention are. in general. crystalline solids. ranging in color from white to pale yellow, slightly soluble in water and lower alcohols and insoluble in benzene. toluene and chloroform.

The compounds of the present invention are identical in scope with those of applications Ser. Nos. 94.59] and 25 l .096 described above and have the priority :late for a disclosure of this scope of Dec. 2, I970. solved in a water miscible organic solvent, with an These compounds are new his(hen7.ylideneamino)- aqueous or aqueous alcoholic solution of a compound guanidines of the formula: of the formula:

| N H II H 1. CNl|-lC-TNC R i l l I "ll M 7 I wherein R R R,-,. Rm R R R and n are as def lined hereinhefore, and pharmacologically acceptable HNN 5 .lQld salts thereof |.e., salts of pharmaceutlcally accept- JhlC acids.

Certain of the above active novel compounds can be R arepared by reacting a compound of the formula:

wherein R is as hereinabove described and X is the o anion ofa pharmacologically acceptable acid. The mixture is heated to from 50C. to the boiling point of the R c4! solvent and held there for from one to ten minutes and then cooled to room temperature. The precipitated product is collected. washed with ethanol and/or other 7S 2 and dried.

' Other methods of preparing the instant compounds wherein R, and R are as hereinahove described, disare illustrated by the equations which follow:

l i R, C=O H,N-N-C=N .HX

PI! I R. C=NNC=N .HX

l H R1 H s l n R 2 R. C=N-li\lC--NH,

+R x B,

H lll R, f=N-N-C==N H,NNH

- I H l H l H N l u R, C=N-N-CNNH, iHx

wherein R R R R R;, R, n and X are as hereinubove described and R is lower alkyl.

aluminum hydride reduction of the bis(benzylideneamino)guanidine to yield the dihydro derivative Some of the instant compounds herein described. f the parent. The process is generally carried out in wherein R, and R are the same, R and R, are the anhydrous ether under an inert atmosphere, such as a same. R and R are the same, and R is hydrogen, are blanket of nitrogen. The reaction is illustrated below. prepared by the equation illustrated as follows:

R,, T H IL H i 4 II I R (---T'\YNH [LN RI =N T C- II-J N=( R l i I in. H, in R t.

2 mules 1 mole lithium aluminum h \dridc l H N H I II I R1 C=NI| IC I NH(H R a R t H wherein R R R;. R, and R are as heretofore de- VNWN M(:NH Hz senbed and R, and R are halogen trifluoromethyl or i trlfluoromethoxy. H R Among the novel compounds within the scope of the R present invention are the following: l,3-bis(4- 2 chlorobenzylideneamino)guanidine nitrate, l 3-his(4 chlorobenzylideneumino)guanidine hydrochloride. l, where R1 2, 1, and n are 35 herembefOre 3-his(4-chlorohenzylideneamino)guunidine methosul scrlbed and Z [S chlorlne 0r bromine. fate, l.3-bis(4-hromobenzylideneumino)guunidine ni- Compounds in which R is loweralkanoyl are pre- Irate, l,3-his(4-hromohenzylidcnezlmino)guanidine hypared by reaction of the compounds in which R is H with the appropriate organic acid anhydride. E.

E. The following process is directed to a lithium drochloritle l,3-his( 3.4- dichlorohenzylidcneumino)guunidinc nitrate. 1,3- his( 3 ,4-dichlorohenzylideneamino )gu'tinidine hydrochloride. l.3-bist4-cyanohenzylideneamino)guanidine nitrate. l,3-bis(4-cyanohenzylideneamino)guanidine hydrochloride, l-(4-hromobenzylideneamino)-3-(4- cyanobenzylideneamino)guanidine hydrobromide. l- (4-bromobenzylideneamino)-3-(4- chlorobenzylideneamino )-guanidine hydrochloride l-( 4-chlorohenzylidcneamino )-3-[4-( trifluoromethyl )benzylidencaminolguanidine hydrochloride. l.3-bis-(4-chlorohenzylideneamino)-l .3- dimethylguanidine, l 3-bis( 4- chlorobenzylideneamino )-l ,3-dihutylguanidine hydrobromidc. l 3-bis( 4-chlorobenzylideneamino )-2- acetylguanidine. and l 3-bis-(4-chlorohenzylidene)-lmethylguanidine hydrobromide.

The active components and novel compounds of the present invention are highly active antiprotozoal agents in warmhlooded animals. For example, these compounds have anticoccidial activity against El'meriu lencllu as shown by the following test: The animals were Peterson Cross Cockerels 7 days old and of approximately equal size and weight. These cockerels were divided into groups and the groups were placed in separate cages with wire floors. Medicated and control diets were then presented to the groups of hirds 2 days before inoculation while they were still in uncontaminated quarters. During the entire period of the tests the birds ate and drank ad libitum. Control groups were maintained on a standard unmedicated commercial type chicken diet. Test groups were maintained on the same standard diet in which a measured concentration of test compound had been incorporated homogeneously. The cockerels were inoculated once orally with sporulated oocysts of Einu'riu lure/1a. The number of oocysts inoculated directly into the crops of all cockerels in the tests was sufficient to produce high mortality in the untreated controls. The quantity necessary to produce high mortality was determined prior to the times of inoculation by giving graded quantities of cysts to comparable birds. Seven days following inoculation the tests were terminated and the mortality rate was recorded for cach group. The results of these tests appear in Table I and show conclusively that these Compounds are highly effective as anticoccidial agents. The tests represent very severe laboratory challenges, and lower concentrations than those shown would be effective under practical field conditions.

TABLE I Parts Per Number of Compound Salt Million in Diet Birds Treated Survival l.3-Bis( 4-chlorobenzyli- Nitrate O 100 32 deneamino)guanidine I8 70 77 36 7O 96 54 lDO lJ-BisM-chlorobenzyli- Methodeneamino)guanidine sulfate 0 28 20 39 59 40 40 90 40 98 l.3-Bis(4-chlor0- Hydrohenzylideneamino)- chloride 0 20 20 guanidine 84S 20 45 17 20 33 20 100 l.3-Bis(4bromo Nitrate (J 20 45 benzylideneamino)- guanidinc I7 20 35 20 I .3-Bis( 3.4-dichl0ro Nitrate 0 20 30 henzylideneamino)- guanidine b0 [0 lOO l.3-Bis(4 cyano- Nitrate O 20 2O benzylideneamino)- guanidine 30 l0 80 60 l0 l0!) l.3-Bis(4-iodo- HCI O 20 0 benzylideneamino) guanidine 3O 2O 55 l,3-Bis( 4-fluor0- Nitrate 0 20 45 benzylideneamino)- guanidine 93 5 80 l3-Bis(4-triflu0ro- Hydrochlor- 0 20 70 methylhenzylidenm ide amino)guanidine l20 If] [00 |.3-Bis(4-ch|oro Hydro- O 40 45 henzylideneamino)- bromide l.3-dimethylguanidine 3O l0 I20 5 100 2-Acetyl-l t3 his(4 0 60 47 chlorohenzylideneamino)- guanidine 5 2O 67 ll) 20 )5 3(1 5 l0() l( 4-chlorobenzyl- I 5 I0 90 amino)-3-(4-chlorobenzylideneamino)guani- 3O 10 10(1 dine l3-his(4-tril'luoro- Hydro- 0 20 55 methoxybenzylidenc chloride aminolguanidinc 5 ll) 81) l0 l0 lUO l.3-bis(4-chloro- Hydro- (I 20 (10 benzylamino)guanidinc chloride l0 ll) )0 l5 ll) 90 20 10 l()(] The compounds of the present invention have high activity against other coccidial species in chickens. Thus, I .3-bis( 4-chlorobenzylideneamino )guanidine completely protected treated chickens from mortality due to Er'meriu necarrix. and from poor weight gains due to 1:. uceri'ulinu. E. hrmietti. E. nmxinm or If. mii'uri. Methods used were essentially identical with those previously cited with appropriate modifications. Weight gains were determined 7 days after single exages whereas the only prior art compound of the reference (compound 17) was active only at I20 p.p.m.

It is anticipated that the compounds of this invention will prove widely useful in a variety of vehicles, modes or means of administration or dispersal for the purpose of minimizing, preventing. controlling, treating, ameliorating or curing protozoa] infections with sensitive organisms. One of these infections is coccidiosis which is a protozoal parasitic disease widespreaad in animals.

perimental inoculations with the designated species of lo causing a greater economic loss among domestic and coccidia. The results are summarized in Table II.

game animals in temperate climates than any other pro- TABLE II Anticoccidial Activity of I.3-Bis(d-chlorobenzylideneamino)guanidine I control Eimena Spp. Ppm in Diet No. Birds it Survival Weight gain Salt necatrix I9 2 I 3 I metho- I I00 80 sulfate 20 I00 I03 acervulina 0 20 I00 57 nitrate 45 20 I00 99 brunetti 0 20 I00 76 hydro- IS 20 I00 I00 chloride 30 20 100 95 maxima 0 20 I00 58 hydro I5 20 I00 I01 chloride 30 20 I00 95 45 20 I00 I00 mivati 0 20 95 S2 hydro- IS 20 I00 86 chloride 30 20 100 91 .45 20 I00 100 In the Lieber et al. reference J. Org. Chem. Vol. 17, tozoan disease. Coccidiosis is the most important anipages 5 I 8-522 I952) there are described compounds mal parasitic disease of chickens the causative agents in Table I which may be considered position isomers or being protozoa of the genus Eimeria. and is also imporhomologues or analogs of the present compounds. tant in other domestic animals such as turkeys, sheep. However, these compounds have been found inactive cattle and pigs. (with one exception) as anti-coccidial agents. Number- The present compositions and novel compounds are ing the compounds of Table l in the Lieber et al. refer active in warm-blooded animals as anti-malarial agents. ence from I to I7 the results of the testing for anticoc- When tested in mice in the range of from I50 mgjkg. cidial activity is as follows: to 300 mg./kg. they show an activity comparable to quinine.

Although administration of the compounds for coccidiosis will generally be most practical in or with the TABLE III feed. or m the drinking water, the compounds may also be administered to individual hosts in the form of tab- Prior art Compounds (Duimiwwr Dowgu (pans lets. drenches, capsules or the like or by II'IJBCIIOH. aminoguanidine) per millionl Activit These latter methods of administration are. of course, less practical for treatment of large groups of animals 4) t -Lhlurohcnzaldch\tlc I20 inactive Hhlumhunmmchguu [3U inactive than they are for treating limited numbers of animals. In p h r l y p m i but they are quite practical for use on a small scale or 7| mnitrovenzalt chyde II Inactive H] m-nitrobcnzaldchydc I20 inactive on mdwldudl basis t a; pipuronul 125 inactive With the compounds of the instant invention. medi- 'l cated feeds are usually prepared by thoroughly admix- IZ) salicylaldchydc 200 Inactive r I l uccmphcmmc 25 indgmc ing about 0.0005 to 005/: by weight and preferably 17) l l about 0.0015 to 0.025% by weight of active compound I7) p-liromoacctophcnone f ll muctnc I I i v I (hmpoumlh pwwm lump with a nutritionally balanced animal feed. as for exam lion iDcriuuiws f IJ- ple. the chick feed described in the examples hereinaf- Dian!inoguanidinl: I whhlmhcnmhlchylu mimic) Where it desirable to prepare a concentrate or prep chlonilwnmltlch dc (mclbosul- 2 aun mix for ultlmate dilution in feed to the above levels fate] r t [Hmlummnmkkh)dc mm mm generally about I to 25/: and preierablyabout to chloride) I071 by weight of medicament is blended with an edible 'l l organic or inorganic carrier. e.g. corn meal or corn pJULlUl'ILIH/jtldch\llC Ih tlro- 30 actnc chlurikk, and soybean meaL or alfalfa. or mineral salts contam- The compounds of the present invention most closely related to the prior art are active at relatively low dosing a small amount of an edible dusting oil such as. for example. corn oil. onsoybean oil. The thus prepared premix may then be added to the complete animal poultry feed prior to administration.

DETAILED DESCRIPTION The following examples describe in detail the preparation of representative compounds of the present invention. In these examples the starting materials, 4- chlorohenzaldehyde, 4-bromobenzaldehyde, 3,4- dichlorobenzaldehyde, and 4-cyanobenzaldehyde are each widely used chemical reagents available from commercial sources. The compound l,3- diaminoguanidine nitrate, or methosulfate may be prepared as described by Keim. Henry and Smith, Journal of the American Chemical Society, 72, 49444964 (I950). The preparation of the compound 1,3- diaminoguanidine hydrochloride is shown in Phillips and Williams, ibid, 50, 2465 (1928). The synthesis of 1.3-diaminol -methylguanidine hydrobromide is shown by Kroeger, et al., Ann. 664 I56 H963). The preparation of l,S-diamino-l.3-dimethylguanidine hydrobromidc is described by McBride, et al., J. Org. Chem. 22 l52 (1957].

EXAMPLE 1 Preparation of |,3-Bis( 4-chlorobenzylideneamino )guanidine nitrate, hydrochloride and methosulfate A boiling solution of l4.l grams of 4 chlorobenzaldehyde (slight excess) in 250 milliliters of ethanol is stirred vigorously as a solution of 6.1 grams of l,3-diaminoguanidine nitrate and 0.5 milliliters of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is then allowed to stand for several hours. The precipitate which forms is collected. washed with hot ethanol. air-dried and finally dried at 60C. under reduced pressure. The yield is 14.0 grams of product and the melting point is l98C. with decomposition.

The hydrochloride or methosulfate salt may be prepared by this same procedure. substituting equivalent amounts of the appropriate guanidine salt and employing 0.5 milliliters of the appropriate acid. The hydrochloride salt melts at 289290C. with decomposition. The methosulfate salt melts at 2l7224C. with decomposition.

EXAMPLE 2 Preparation of l ,3-Bis( 4-chlorobenzylideneamino )guanidine The free base of the title compound is prepared by suspending 8 g. of the nitrate salt (Example I in 200 ml. of anhydrous ethanol, adding 2.5 ml. of lN sodium hydroxide solution, stirring and heating until the reaction mixture becomes homogeneous. and finally cooling the solution and filtering the resultant solid. The melting point of the free base is l87l88C.

EXAMPLE 3 Preparation of l,3-Bis( 4-bromobenzylideneamino )guanidine Nitrate A boiling of 20.0 grams of 4- bromobenzaldehyde in 250 milliliters of ethanol is stirred vigorously as a solution of 6.! grams of L2- diaminoguanidine nitrate and 0.5 milliliters of concen trated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is allowed to stand for several hours. The precipitate which forms is collected. washed with hot etha nol, air dried and finally dried at 60C. under reduced pressure. The yield is l6.5 grams of product and the melting point is l78-l 80C. with decomposition.

solution EXAMPLE 4 Preparation of I,3Bis( 3 .4-dichlorobenzylideneamino )guanidine Nitrate A boiling solution of l7.6 grams of 3,4- dichlorohenzaldehyde in 250 milliliters of ethanol is stirred vigorously as a solution of 6.l grams of 1,3- diaminoguanidine nitrate and 0.5 milliliters of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is then allowed to stand for several hours. The precipitate which forms is collected, washed with hot ethanol, air dried and finally dried at 60C. under reduced pressure. The yield is l7.5 grams of product and the melting point is l-l96C. with decomposition.

EXAMPLE 5 Preparation of l ,3-Bis( 4-cyanohenzylideneamino )guanidine Nitrate A boiling solution of l3.l grams of 4- cyanobenzaldehyde in 250 milliliters of ethanol is stirred vigorously as a solution of 6.] grams of 1,3- diaminoguanidine nitrate and 0.5 milliliters of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the tem perature recedes to room temperature. The reaction mixture is then allowed to stand for several hours. The precipitate which forms is collected. washed with hot ethanol, air dried and finally dried at 60C. under reduced pressure. The yield is l5.l grams of product and the melting point is 205-2l0C. with decomposition.

EXAMPLE 6 Preparation of l,3-Bis( 4-iodobenzylideneamino )guanidine Hydrochloride Following the procedure of Example I and substituting 4-iodobenzaldehyde for 4-chlorohenzaldehyde and l ,2-diaminoguanidine hydrochloride for l ,3- diaminoguanidine nitrate the product of the example is obtained. The hydrochloride has a melting point of 28829lC.. dec.

EXAMPLE 7 Preparation of l,3-Bis(4-fluoroben2ylideneamino)guanidine Nitrate Using the procedure of Example I and substituting 4-fluorobenzaldehyde for 4-chlorobenzaldehyde the product of the example is obtained. The nitrate has a melting point of l6)l 70C.. dec.

EXAMPLE 8 Preparation of Methyl thiocarbazimidate hydrochloride Excess methyl chloride is collected in a dry iceacetone-cooled trap and added to a tared pressure vessel containing 9|.l g. of powdered thiosemicarbazide in 600 ml. of anhydrous ethanol. Weighing the vessel plus contents shows that 53 g. of methyl chloride has been added. The reaction mixture is magnetically stirred while heating in an oil bath temperature of 77 to l 10C. for 48 minutes. After 33 minutes. the reaction has become homogeneous. it is cooled in ice and the resultant rose-white solid filtered and dried in a vacuum oven. The yield of the title compound is l2l g. melting point l54l55C.

Substitution of dimethyl sulfate. ethyl iodide or pro pyl bromide for methyl chloride and allowing the reactions to proceed in refluxing anhydrous ethanol instead of under pressure. results in the preparation of methyl thiocarbazimidate methosulfate. ethyl thiocarbazimidate hydroiodide and propyl thiocarbazimidate hydrobromide. respectively.

EXAMPLE 9 Preparation of Methyl 3-( 4-chlorobenzylidene )thiocarbazimidate hydrochloride A solution of 3.8 g. of 4-chlorobenzaldehyde in 10 ml. of warm absolute ethanol is added all at once to a stirred solution of 5 g. of methyl thiocarbazimidate hydrochloride in l()() ml. of warm absolute alcohol. The

reaction mixture is stirred at room temperature for 5 about l5 minutes and cooled in we. [be white solid EXAMPLE 10 Preparation of Methyl 3-( 4-chlorobenzylidene )thiocarbazimidate hydrochloride A 10% molar excess of methyl chloride is added to 2. l4 g. of 4chlorobenzaldehyde thiosemicarbazone and 25 ml. ofa anhydrous ethanol in a pressure vessel. The reaction mixture is magnetically stirred and heated in an oil bath for l A hour. The crystalline title compound separates on cooling and is filtered off and air dried.

EXAMPLE l 1 Preparation of l.3-Bis( 4-chlorobenzylideneamino )guanidine hydrochloride A solution of 10] g. of 4-chlorobenzaldehyde in 40 ml. of warm 95% ethanol is added portionwise to a stirred solution of diaminoguanidine hydrochloride in 450 ml. of 907: ethanol at C. Addition of the first portion causes rapid boiling and the reaction mixture is cooled to a little above room temperature before the remainder of the 4-chlorobenzaldehyde solution is added. Stirring is continued for 15 minutes and the reaction mixture is cooled in ice. filtered. and air dried. The yield is 122 g. of solid, melting point 295C. with decomposition.

The same product is obtained when l-amino-3-(4- chlorobenzylideneamino )guanidine hydrochloride (Example I3) is allowed to react under similar conditions as above with an equimolar amount of 4- chlorobenzaldehyde.

The same product is also obtained from the reaction of methyl 3-(4-chlorohenzylidene)thiocarbazimidate (Example l0) with the hydrazone of 4- chlorobenzaldehyde in refluxing 959! ethanol. The bydrazone of 4-chlorohen2aldehyde is prepared according to the procedure for the synthesis of hydrazones of aromatic aldehydes and ketones outlined in G. Newkome and D. Fishel. J. Org. Chem. 3i 677 (1966).

EXAMPLE l2 Preparation of l-Amino-3-( 4-chlorobenzylideneamino )guanidine Hydrochloride To a solution of 2.6 g. of methyl 3-(4- chlorobenzylidene)thiocarbazimidate in 10 ml. of boil ing absolute ethanol is added 0.6 g. of hydrazine hydrate. The reaction mixture is cooled in ice and the solid l-amino-3-(4-chlorobenzylideneamino)guanidine removed by filtration. Treatment with ethanolic hydro gen chloride gives the subject compound. melting at 243244C.

Similarly. the reaction of bromobenzylidene )thiocarbazimidate methosull'ate. ethyl 3-(4-cyanobenzylidene)thiocarbazimidate h droiodide, and propyl 3-(3.4-dichlorobenzylidene)thiocarbazimidate hydrobromide with hydrazine yield. rcspectivcly, l-amino3-( 4- bromobenzylideneamino)guanidine methosulfate. lamino-3-(4cyanobenzylideneamino )guanidine hydroiodidc. and l-amino 3-( 3.4- dichlorobenzylidencamino)guanidine hydrobromide.

The preparation of the subject compound may also be accomplished as follows: of L3- methyl 3-(4- diaminoguanidine hydrochloride is dissolved in 1800 ml. of boiling ethanol. To this boiling solution. 28 g. of 4-chlorobenzaldehyde in 300 ml. of ethanol is added over a period of 8 hours. The reaction mixture is then cooled at C. overnight. clarified, and the filtrate concentrated to 500 ml. volume and cooled at 0C. 29 g. of precipitate is obtained. This is slurried in 300 ml. of water. the pH adjusted to 88.5 with sodium hydroxide solution. the slurry heated to boiling and filtered. Cooling the filtrate gives 18 g. of essentially pure product melting at 243244C.. as in the previous preparation.

EXAMPLE 13 Preparation of 1 4-Bromobenzylideneamino 3-( 4- chlorobenzylideneamino)guanidine hydrochloride A solution of 1.85 g. of 4-bromobenzaldehyde in 11) ml. of ethanol is added to a solution of 2.48 g. of lamino-3-( 4-chlorobenzylideneamino)guanidine hydrochloride in 25 ml. of boiling 95% ethanol. The reaction mixture is cooled and the solid product removed by filtration and air dried. lt melts at 286288C. with decomposition.

ln a similar manner the reaction of l-amino-3-(4- bromobenzylideneamino)guanidine methosulfate with 4-chlorobenzaldehyde gives the methosulfate salt of the subject compound. The reaction of l-amino-3-(4 cyanobenzylideneamino)guanidine hydroiodide with 4-chlorobenzaldehyde gives 1-(4- chlorobenzylideneamino)-3-(4- cyanobenzylideneaminoJguanidine hydroiodide; the reaction of 1-amino-3-( 4- chlorohenzylideneamino )guanidine hydrochloride with 4-cyanobenzaldehyde affords the corresponding hydrochloride salt which melts at 297298C. The reaction of l-amino-3-( 3.4- dichlorobenzylideneamino )guanidine hydrobromidc and 4-chloroben2aldehyde gives l-( 4- chlorobenzylideneamino)-3-(3.4- dichlorobenzylideneamino)guanidine hydrobromide; the reaction of l-amino-3-( 4 chlorobenzylideneamino)guanidine hydrochloride with 3.4-dichlorobenzaldehyde gives the corresponding hydrochloride salt which melts at 288C.

EXAMPLE 14 Preparation of 1-Amino-3-l [4-trifluoromethyl lbenzylideneaminolguanidine Hydrochloride An ether solution of 34.8 g. of 4-(trifluoromethylj benlaldehyde is slowly added to a hot (7U-8()C.) solution of 4| .5 g. (50)? excess) of l.3diaminoguanidine hydrochloride in aqueous ethanol. The slow addition rate permits the ether to boil off. and a slow reaction mixture is maintained. After heating an additional thirty minutes. the mixture is cooled and taken to dryness under vacuum. The solid residue is extracted with water to remove the excess l.3-diaminoguanidine hydrochloride. and with hot ethanol to remove any l.3- bis[ 4-trifluoromethyl Jbem'ylideneamino lguanidine hydrochloride present. The insoluble residue 14.4 g.) is essentially pure l-amino-3[(4-trifluoromethyl)benzylideneaminolguanidinc hydrochloride. melting at 247-249C. with dec.

EXAMPLE 15 Preparation of 1-( 4-Chlorohenzylideneamino )-3-[ 4- trifluoromethyl )benzylideneamino lguanidine Hydrochloride A solution of 1.41 g. of 4-ch1orobenzaldehyde in ml. of ethanol is added to a solution of 2.82 g. of lamino-3-[4( trifluoromethyl )benzylideneaminolguanidine hydrochloride in ml. of boiling 957: ethanol. Cooling the reaction mixture gives the subject compound as a crystalline solid melting at 263C. Alternatively. under similar reaction conditions, 1.81 g. of 4- (trifluoromethyl)benzaldehyde. and 2.48 g. of 1- amino-3-(4-chlorobenzylideneaminolguanidine hydrochloride yield the same product.

Replacement of the 4-chlorobenzaldehyde by an equivalent of 4-bromobenzaldehyde gives l-(4- m bromobenzylideneamino)-3-[4-(trifluoromethyl)benzylideneamino]guanidine hydrochloride. melting at 265268C. Similarly. 3.4-dichlorobenzaldehyde yields l-(3.4-dichlorobenzylideneamino)-3-l4- (trifluoromethyll-benzylideneaminolguanidine hydrochloride. melting at 265-268C., and 4- cyanobenzaldehyde yields l-(4 cyanobenzylideneaminoJ-3-[(4-trifluoromethyl)ben- Zylideneamino]guanidine hydrochloride. melting at 26927lC. Alternatively. the latter three compounds w may also be prepared by the reaction of 4-(trifluoromethyl )benzaldehyde and l-amino-3-( 4- bromohenzylideneamino)guanidine hydrochloride, 1- amino-3-( 3.4-dichlorobenzylideneamino )guanidine hydrochloride, and l-amino-3-( 4- S cyanohenzylideneamino)guanidine hydrochloride. re-

spectively.

EXAMPLE 16 Preparation of Chick Diet 40 The following specific feed composition is an example of poultry feed as a carrier for the coccidiostats described hereinbefore.

Vitamin-Amino acid (1.50 Trace Minerals (1.1% Sodium Chloride 0.39 Dicalciuni Phosphate |.2'/r Ground Limestone 0.5% Stabilized Fat 49; 5Q Dehydrated Alfalfa. l7"l protein 2% (orn (ilutcn Meal. 41" protein 5'/ Mcnhadcn Fish Meal. fit); protein 5'? Soybean Oil Meal. 44% protein 30% Ground Yellow (orn. Finc To lhe vitamin pre-mix in the above feed composition is prepared from the following formulation. The ex prcssions of quantity relate to units per kilogram of the feed composition.

Butylatcd Hydro tulucnc I25 mg di-Mcthioninc 51") mg. Vitamin A 331") 1.1 Vitamin D, lllll) l.(.l'. ,5 Ribollznin 4.4 mg. Vitamin l; 2.2 l.l Niacin Z7 5 mg Panlothcnic Acid 8.8 mg (holine ('hloridc Still mg -Continued Folic Acid L43 mg. Menadione Sodium Bisulfatc l.l mg. Vitamin B l l meg. Ground Ycllov- Corn. Fine To gm.

EXAMPLE 17 Preparation of l .3-Bis( 4-trifluoromethylbenzylideneamino )guanidine hydrochloride A solution of IO g. of 4-trifluoromethylbenzaldehyde in the minimum amount of 95% ethanol is added to a boiling solution of 3.6 g. of diaminoguanidine hydrochloride in 50 ml. of 95% ethanol and a few ml. of water. The solution is stirred and allowed to cool and the solid removed by filtration and washed with 95% ethanol and ether. The yield is 9.6 g. of white solid with a melting point of 272-273.5C. with decomposition.

EXAMPLE 18 Preparation of l.3-Bis( 4-chIorobenzylideneamino)- l .3- dimethylguanidine hydrobromide A mixture of l4.l grams of 4-chlorobenzaldehyde. 4.6 grams of methylhydrazine and 500 ml. of dried benzene is stirred at reflux in a continuous water removal apparatus until no further separation of water is noted. The benzene solution of the resultant methylhydrazone of 4-chlorobenzaldehyde is cooled to room temperature and treated with a solution of 5.3 grams of cyanogen bromide in 100 ml. of benzene. The reaction mixture is stirred at reflux for four hours. a white precipitate separating out during this time. The precipitate is filtered from the hot solution, washed and dried. it is recrystallized from ethanol to yield 4.0 grams of the pure compound melting at 223225C. with decomposition.

The same compound is obtained when two molar equivalents of 4-chlorobenzaldehyde and one molar equivalent of 1.3-diamino-l .B-dimethylguanidine hydrobromide are refluxed in ethanol solution in the presence of a little 48% aqueous hydrobromic acid for a few minutes.

EXAMPLE 19 Preparation of l.3-Bis(4-ChlorobenzyIideneamino l .3-di-nbutylguanidine hydrobromide The preparation of the above compound is carried out by the procedure of Example 18. an equivalent of n-butylhydrazine replacing the methylhydrazine. The isolated product after recrystallization from ethanoldiethyl ether decomposes about 150C.

EXAMPLE 20 Preparation of l 3-Bis(4-Chlorobenzylideneamino)- l methylguanidine hydrobromide The preparation of the title compound is carried out essentially by the procedure of Example 1. 7.3 grams of l.B-diamino-l-methylguanidinc hydrobromide replacing the l.B-diaminoguanidine nitrate and 0.5 ml. of 48% HB. being employed as catalyst. The yield of product is l5.-l grams and the melting point is 27h278C.

EXAMPLE 21 Preparation of 2-Acetyll .3-bis(4-chlorobenzylideneaminoguanidine A mixture of 20 g. of l.3-bis( pchlorobenzylideneamino)guanidine free base and 9 ml. of acetic anhydride in 300 ml. of anhydrous ether is stirred at reflux for l6 hours. then filtered to give a solid containing starting material and acetylated material. The solid is reacted with an additional 3 ml. of acetic anhydride in 300 ml. of toluene for 1 hour. cooled to room temperature and filtered. The solid 14 g.) is dissolved in 100 ml. of chloroform and treated with 50 ml. of 3 N hydrochloric acid. and the resulting solid is filtered, the crude product is slurried in I00 -ml. of boiling chloroform. filtered. and dried to give 7.2 g. of 2-acetyll .3-bis( 4- chlorobenzylideneamino)guanidine hydrochloride. melting point l93-l94C.

The hydrochloride salt is partitioned between chloroform and aqueous sodium bicarbonate. and the chloroform layer is dried and evaporated to give Z-acetyl-l .3-

bis( 4-chlorobenzylideneamino )guanidine. melting point l97-2()0C. (dec.

The reaction of l,3-bis( phydride in refluxing ether gives l,3-bis(4- cyanobenzylideneamino)-2-propionyl)guanidine.

EXAMPLE 22 Preparation of l-( 4-Chlorobenzylamino )-3-( 4- chlorobenzylideneamino )guanidine A mixture of 0.95 g. (0.025 mole) of lithium aluminum hydride in I00 ml. of anhydrous ether is stirred under nitrogen as 4.0 g. (0.0l2 mole) of l,3-bis(pchlorobenzylideneamino)guanidine free base is added in portions over a five-minute period. The reaction turns green. and finally brown with gas evolution during the addition. After adding an additional 100 ml. of ether and stirring at room temperature for 3 /2 hours. the reaction mixture is poured over 500 ml. of icewater mixture with stirring. calcium carbonate added to facilitate separation of the phases. and the yellow etheral layer separated. The aqueous layer is washed with 50 ml. of ether. and the combined ether layers washed with two 50 ml. portions of water. then cooled to 5 and filtered to give l.3 g. of yellow l-(4- chlorobenzylamino)-3-(4- chlorobenzylideneamino)guanidine. melting point ll 73C. Additional material may he obtained from the mother liquors.

The same compound is synthesized by the reaction of cquimolar quantities of p-chlorobenzylhydrazine and methyl-3-( 4-chlorobenzylidene )thiocarbazimidate hydrochloride (see Example l0) in hot ethanol. It is also prepared by the reaction of equimolar amounts of l( pchlorobenzyl)-S-methylisothiosemicarbazide and hydrazine in warm ethanol, which affords l-amino-3-(pchlorobenzylamino)guanidine. followed by treatment of the latter with an cquimolar quantity of chlorobenzaldehyde in hot isopropanol.

EXAMPLE 23 Preparation of l .3-his( 4-Chlorobenzylamino )guanidine Hydroiodide The starting materials for this reaction are literature compounds and are prepared in the following manner. p-Chlorobenzylhydrazine from heating p-chlorobenzyl chloride with excess hydrazine hydrate in i-propanol and distilling: F. E. Anderson et al.. J. Med. and Pharm. Chem.. 5. 221 (1962). I-(p-chIorobenZyH-S methylisothiosemicarbazide hydroiodide is made from methyl iodide treatment in refluxing ethanol of l-(pchlorobenzyl )thiosemicarbazide. which in turn is made from 47r sodium amalgam in refluxing 80% ethanol reduction of p-chlorobenzaldehyde thiosemicarbazone: E. Hoggarth and E. H. P. Young. J. Chem. Soc. 1582 1950 A solution of 0.7 g. (4.5 mmole) of p-chlorohenzylhydrazine and 1.6 g. (4.5 mmole) of chlorobenzyl)'S-methylisothiosemicarbazide hydroiodide in 25 ml. of tetrahydrofuran is heated at reflux for one hour. then rotary evaporated to give a semisolid product which is dissolved in 10 ml. of hot tetrahydrofuran and diluted with ether to give an oil which crystallizes on standing in the cold. Collection and recrystallization from chloroform-methylene chloride-ether gives 1.3-bis-(4-chlorobenzylamino)guanidine hydroiodide. melting point l42l45C.

EXAMPLE 24 Preparation of l.3-bis( 4-Trifluoromethoxybenzylideneamino )guanidine Hydrochloride A micro 3-n eck flask filled with 0.60 g. (0.025 g. equivalent) of magnesium turnings is flame-dried under nitrogen. then ml. of anhydrous ether is added followed by 1 ml. of a solution of 5.0 g. (0.021 mole) of p-hromopheny[trifluoromethyl ether in ml. of anhydrous ether. The reaction mixture is stirred under nitrogen for two hours or until the Grignard reaction beings; remaining solution is added dropwise. allowing the mixture to reflux from the heat of reaction. After addition is complete. 5 ml. of ether is added and stirring continued an additional V: hour.

To the resulting Grignard solution is added dropwise with stirring under nitrogen 3.0 g. (0.022 mole) of N- methylformanilide in 5 ml. of ether at such a rate as to cause mild reflux of the mixture. After addition is com plete. the reaction mixture is stirred an additional hour and 25 ml. of [0)? sulfuric acid solution cautiously added dropvvise. When all the Mg has dissolved. the aqueous layer is separated and washed with two 20 ml.

(ill

portions of ether. and the combined ethereal layers washed with saturated sodium bicarbonate solution. water. and saturated sodium chloride solution (20 ml. of each). and dried (magnesium sulfate). Evaporating solvent gives 5.4 g. of a red oil containing about 20% of the desired aldehyde (estimated from integration of the NMR signals for aldehydic and aromatic protons).

The crude aldehyde oil from above is added to a boiling solution of 0.4 g. (3.2 mmole) of diaminoguanidine hydrochloride in 25 ml. of 957: ethanol. cooled. fil tered off amorphous material. diluted with l0fold excess of ether to cloudiness, cooled and filtered to give 3-bis-( 4 trifluoromethoxybenzylideneamino )guanidine hydrochloride. melting point 265-268C. (dec.

Additional material can he obtained from the mother liquors.

1 claim:

1. A substituted guanidine of the formula:

wherein R, and R are halogen. trifluoromethyl or cyano. R and R.. are hydrogen or halogen. R and R are hydrogen or lower alkyl and R is hydrogen or lower alkanoyl or a salt thereof with a pharmaceutically acceptable acid.

2. A substituted guanidine of the formula:

claim I:

claim l:

hydroclaim l:

Page 1 of 2 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 319011944 Dated August 26, 1975 Andrew Stephen Tomcufcik Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 2, line 7, should be line 9, after "when (first occurrence) insert and after "is (second occurrence) delete "when line 10, should be line 39, should be line 41, should be (both occurrences) Column 4, last formula on the page should read:

H I H N O I II II R C=N-1]I-CI;I-NH R C-H-- Column 5, third formula on the page should read:

H I R C==N "NH I l l l R6 n n R8 Column 5, line 28, should be line 63, should UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 r 901 I 944 Inventor(s) Andrew Stephen Tomcufcik Dated August 26 1975 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 20, Claim 1,

9 N ll C=N -N I I H R '7 [SEAL] Arrest:

RUTH C. MASON Arresting Officer the formula should read:

twenry-third 0f March 1976 C. MARSHALL DANN Commissioner of Parents and Trademarks Pagei Of 2 

1. A SUBSTITUTED GUANIDINE OF THE FORMULA:
 2. A substituted guanidine of the formula:
 3. The substituted guanidine according to claim 1: 1,3-bis(4-halobenzylideneamino)guanidine.
 4. The substituted guanidine according to claim 1: 1,3-bis(4-chlorobenzylideneamino)guanidine.
 5. The substituted guanidine according to claim 1: 1,3-bis(4-chlorobenzylideneamino)guanidine hydrochloride.
 6. The substituted guanidine according to claim 1: 1,3-bis(4-bromobenzylideneamino)guanidine.
 7. The substituted guanidine according to claim 1: 1,3-bis(3,4-dichlorobenzyliDeneamino)guanidine. 